AUMA SQEx Explosion-Proof Part-Turn Actuator (ATEX)

Overview: Certified Quarter-Turn Automation for Hazardous Areas

The AUMA SQEx Explosion-Proof Part-Turn Actuator brings the same explosion-protected construction found in AUMA’s SAEx multi-turn range to quarter-turn valve automation, giving ball and butterfly valves in classified hazardous areas a certified actuation solution that will not act as an ignition source. Like other AUMA Ex-rated devices, the SQEx is engineered so that constructive measures prevent the occurrence of ignition sparks or hot surfaces, with certification performed in close collaboration with national and international certification bodies.

As an authorized supplier of AUMA valve actuators, Seven Star LLC sources and supplies the SQEx explosion-proof part-turn actuator to refineries, gas processing plants, and petrochemical facilities across Oman and the wider GCC. Because hazardous-area quarter-turn valve automation is a frequent requirement across process plant tank farms, pipeline manifolds, and offshore facilities, Seven Star LLC helps engineering teams specify the correct SQEx configuration for their classified zone.

Working Principle: Explosion-Protected Quarter-Turn Actuation

The SQEx drives a valve stem through its rotational swing angle – typically 75° to 105° – using a three-phase AC motor, with limit and torque seating providing precise end-of-travel stopping for both electrical operation and handwheel manual operation. A mechanical position indicator gives local visual confirmation of valve position directly at the actuator, independent of any remote signaling to the control room.

The actuator’s explosion-protected construction houses motor windings, switch compartments, and terminal areas within flameproof or increased-safety enclosures rated for the classified zone, ensuring that even an internal electrical fault cannot become an ignition source for the surrounding atmosphere. For plants requiring modulating rather than simple open-close duty, the SQREx variant within the same platform provides Class C modulating performance while retaining the same explosion-protected housing design.

Engineering Design of the SQEx Actuator

The SQEx is built to IP68 protection standard with an ISO 5211 output flange for direct mechanical compatibility with standard butterfly and ball valves, and covers a torque range of approximately 50 to 2,400 Nm with rotation angles from 75° to 105° and operating times from roughly 4 to 100 seconds for a 90° travel. High enclosure protection and high-quality corrosion protection support reliable field operation, with a standard ambient temperature rating of -30°C to +60°C.

Options for the SQEx include intermediate position switches, tandem-version switches, remote position transmitters, and magnetic limit and torque transmitters, allowing the actuator to integrate with plant control and monitoring systems beyond the basic open-close signal. For integral local control, the AUMA MATIC ACExC 01.2 actuator controls pairing is available for the SQEx/SQREx 05.2 to 14.2 size range.

Key Features

The AUMA SQEx Explosion-Proof Part-Turn Actuator delivers certified hazardous-area quarter-turn automation. Key characteristics include:

• Explosion-proof construction certified for installation in classified hazardous areas.
• ISO 5211 output flange for compatibility with standard ball and butterfly valves.
• Torque range from approximately 50 Nm to 2,400 Nm; rotation angle 75° to 105°.
• IP68 protection class with high-quality corrosion protection.
• Three-phase AC motor with handwheel for manual operation and mechanical position indicator.
• Compatible with AUMA MATIC ACExC 01.2 explosion-protected controls for integral local control.
• Optional intermediate position switches, tandem switches, remote position transmitters, and magnetic limit/torque sensing.

Industrial Applications

The SQEx actuator is deployed wherever a ball or butterfly valve requires certified explosion-proof automation, including refinery tank farms, pipeline manifolds, gas processing plants, and offshore platforms handling flammable liquids or gases. Its ISO 5211 compatibility and proven AUMA platform make it a straightforward specification for projects standardizing on a single actuator family across both multi-turn (SAEx) and part-turn (SQEx) hazardous-area valve automation needs.

Seven Star LLC supports refinery engineering teams, EPC contractors, and plant maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of AUMA explosion-proof part-turn actuators, helping projects meet hazardous-area compliance requirements for their quarter-turn valve automation.

Technical Specifications

The table below summarizes the core specifications of the AUMA SQEx Explosion-Proof Part-Turn Actuator as supplied by Seven Star LLC.

Call To Action

Seven Star LLC supplies the AUMA SQEx explosion-proof part-turn actuator with full manufacturer documentation and regional technical support. Contact our instrumentation and valve automation division for a formal RFQ, to confirm the correct actuator size and certification for your classified zone, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine, correctly configured, and backed by local engineering support.